1.

Internal bisectors of DeltaABC meet the circumcircle at points D, E and Fthen area of DeltaDEF is

Answer»

`2R^(2)COS^(2)((A)/(2))cos^(2)((B)/(2))cos^(2)((C)/(2))`
`2R^(2)SIN((A)/(2))sin((B)/(2))sin((C)/(2))`
`2R^(2)sin^(2)((A)/(2))sin^(2)((B)/(2))sin^(2)((C)/(2))`
`2R^(2)cos((A)/(2))cos((B)/(2))cos((C)/(2))`

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